Water absorption by deep eutectic solvents

Chen, Yu; Yu, Dongkun; Chen, Wenjun; Fu, Li; Mu, Tiancheng

doi:10.1039/c8cp07383j

Cited by 129 publications

(80 citation statements)

References 40 publications

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“…A major experimental challenge is the high hygroscopy of DES and the sensitive dependence of viscosity on the water content, especially at χ w close to 0 [50][51][52] . However, only half of the sources reported the method of desiccation of the DES components prior to experimentation.…”

Section: Discussionmentioning

confidence: 99%

Meta-analysis of viscosity of aqueous deep eutectic solvents and their components

Gygli

Pleiss

2020

Sci Rep

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Deep eutectic solvents (DES) formed by quaternary ammonium salts and hydrogen bond donors are a promising green alternative to organic solvents. Their high viscosity at ambient temperatures can limit biocatalytic applications and therefore requires fine-tuning by adjusting water content and temperature. Here, we performed a meta-analysis of the impact of water content and temperature on the viscosities of four deep eutectic solvents (glyceline, reline, N,N-diethylethanol ammonium chloride-glycerol, N,N-diethylethanol ammonium chloride-ethylene glycol), their components (choline chloride, urea, glycerol, ethylene glycol), methanol, and pure water. We analyzed the viscosity data by an automated workflow, using Arrhenius and Vogel–Fulcher–Tammann–Hesse models. The consistency and completeness of experimental data and metadata was used as an essential criterion of data quality. We found that viscosities were reported for different temperature ranges, half the time without specifying a method of desiccation, and in almost half of the reports without specifying experimental errors. We found that the viscosity of the pure components varied widely, but that all aqueous mixtures (except for reline) have similar excess activation energy of viscous flow $${E}^{excess}_{\eta}$$ E η excess = 3–5 kJ/mol, whereas reline had a negative excess activation energy ($${E}^{excess}_{\eta}$$ E η excess = − 19 kJ/mol). The data and workflows used are accessible at 10.15490/FAIRDOMHUB.1.STUDY.767.1.

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Section: Discussionmentioning

confidence: 99%

Meta-analysis of viscosity of aqueous deep eutectic solvents and their components

Gygli

Pleiss

2020

Sci Rep

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“…Most DESs are very hygroscopic and can absorb water from air. Even a trace amount of water influences their structures and properties [138]. DESs contain cations and anions and, therefore, their binary mixtures with water can be very different from ordinary solvents.…”

Section: General Information On Deep Eutectic Solventsmentioning

confidence: 99%

Deep Eutectic Solvents for Pretreatment, Extraction, and Catalysis of Biomass and Food Waste

2019

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Valorization of lignocellulosic biomass and food residues to obtain valuable chemicals is essential to the establishment of a sustainable and biobased economy in the modern world. The latest and greenest generation of ionic liquids (ILs) are deep eutectic solvents (DESs) and natural deep eutectic solvents (NADESs); these have shown great promise for various applications and have attracted considerable attention from researchers who seek versatile solvents with pretreatment, extraction, and catalysis capabilities in biomass- and biowaste-to-bioenergy conversion processes. The present work aimed to review the use of DESs and NADESs in the valorization of biomass and biowaste as pretreatment or extraction solvents or catalysis agents.

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“…However, this property can be modulated using the plasticizer effect of the water; the addition of small amounts increases substantially the fluidity of the liquid [22,23]. The hygroscopic capacity of several ChCl-based DESs has been studied by Chen et al [24].…”

Section: Introductionmentioning

confidence: 99%

NMR study of choline chloride-based deep eutectic solvents

Delso

Lafuente

Embid

et al. 2019

Journal of Molecular Liquids

100

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Nowadays, the eutectic liquids (DESs) are considered an adequate alternative to the traditional solvents. Therefore, there is an increasing interest in the study of the structure, properties and applications of these mixtures. In this paper, several NMR spectroscopic techniques have been used in order to evaluate the molecular structure of three ternary DESs, composed of choline chloride, urea or glycerol or ethylene glycol, and water. The use of routine and non-routine NMR techniques, such as 1 H, 13 C, correlation experiments, NOESY, ROESY, and diffusion experiments gave us some important evidences pointing to a supramolecular structure of the DES, which may be the origin of their particular behaviour. The mixture containing ethylene glycol shows the feeblest structure. In these ternary solvents, the water is found within the structure that is still retained when DESs are diluted at 10% wt.

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Water absorption by deep eutectic solvents

Abstract: Deep eutectic solvents are found to be highly hygroscopic when exposed to the atmosphere.

Cited by 129 publications

References 40 publications

Meta-analysis of viscosity of aqueous deep eutectic solvents and their components

Meta-analysis of viscosity of aqueous deep eutectic solvents and their components

Deep Eutectic Solvents for Pretreatment, Extraction, and Catalysis of Biomass and Food Waste

NMR study of choline chloride-based deep eutectic solvents

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